JP3177135B2 - motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor which can be used for various kinds of equipment, for example, as a capstan motor of a video tape recorder (hereinafter, referred to as "VTR"), and more particularly to a bearing holder and a peripheral part thereof. Regarding the structure.

[0002]

2. Description of the Related Art For example, a conventional motor used as a capstan motor for a VTR has a structure shown in FIG. In FIG. 5, the motor has a core holder 3 placed at the center of the stator core 2 of the core winding set 1,
The core holder 3 is placed on the substrate 4. From above the stator core 2, the bearing holder 5 is inserted into the central through holes 2 a, 3 a of the stator core 2, the core holder 3, and the through hole 4 a of the substrate 4, and is placed in the recess of the stator core 2. The bearing holder 5 is provided with a screw 1 on the substrate 4 integrally with the stator core 2.
It is fixed at 0. The drive magnet 11 of the rotor case 6 faces the outer periphery of the stator core 2. A bearing is press-fitted and fixed in the bearing holder 5, and the bearing rotatably supports the shaft 12.

The rotor R has a rotor case 6 on which a rotor magnet 11 is mounted and a shaft 12. The stator S is composed of a stator core 2 wound with a coil 7, a core holder 3 made of an insulating material, and the substrate 4 described above. Have.

The core winding set 1 includes a stator core 2, a coil 7 wound around the stator core 2, an insulating core holder 3 made of resin, ceramic, or the like, and a plurality of coils 7 held by the core holder 3 and connected to the core holder 3. And a terminal 8. Note that the stator core 2 is
Is fitted and fixed.

As shown in FIGS. 7 to 9, the bearing holder 5 has an inverted T-shape in longitudinal section. However,
7 to 9, the bearing holder 5 is turned upside down in FIG. In the bearing holder 5, a screw through hole 5b is formed in a flange portion 5a mounted on the core winding set 1, and a plurality of projecting portions 5d extending radially outward around a cylindrical portion 5c are formed. A screw hole 5e is formed in the protrusion 5d in parallel with the axis of the bearing holder 5.

As shown in FIG. 6, the substrate 4 has a substantially triangular through hole 4a into which the cylindrical portion 5c of the bearing holder 5 and a plurality of protrusions 5d around the cylindrical portion 5c are fitted. A cutout 4b into which the positioning pin of the core holder 3 fits is formed at a portion of the through-hole 4a corresponding to a substantially triangular vertex. The substrate 4 is made of an iron plate whose surface has been subjected to an insulating film treatment, on which a circuit conductive pattern is formed by copper foil, and a terminal portion 13 is formed at a position corresponding to the terminal 8. The core winding set 1, the bearing holder 5 and the substrate 4 are overlapped, and the screw 10 penetrating through the stator core 2 and the core holder 3 is screwed into the screw hole 4e of the substrate 4, so that the core winding set 1 and the bearing holder 5 are formed. And the substrate 4 are integrally fixed.

[0007] The cylindrical portion 5c of the bearing holder 5 is shown in FIG.
As shown in FIG. 9 to FIG. 9, they are formed in two stages: a large diameter portion 5g at the base and a small diameter portion 5h at the distal end. The large-diameter portion 5g serves as a positioning portion when assembling the motor. When the cylindrical portion 5c of the bearing holder 5 is fitted into the through-hole 4a, the large-diameter portion 5g is used.
The bearing holder 5 is positioned with respect to the substrate 4 by fitting the large-diameter portion 5g into the partially arcuate wall surface of the through-hole 4a of the substrate 4 while fitting the gutter into the through-hole 4a using the g as a guide. In addition, the small-diameter portion 5h connects the motor to V
When the motor is mounted on the chassis 20, it forms a positioning portion when the motor is mounted on the chassis 20 such as a TR.
The motor is positioned with respect to the chassis 20 by fitting the small diameter portion 5h into the through hole of the chassis 20 using the small diameter portion 5h as a guide and abutting the small diameter portion 5h on the wall surface of the through hole of the chassis 20.

[0008]

As described above,
The capstan motor has a criterion for incorporating the bearing holder 5 into the capstan motor,
The conventional capstan motor requires a standard when incorporated into a TR or the like.
g is a reference when incorporating the bearing holder 5 into the capstan motor, and the small diameter portion 5h formed on the bearing holder 5 is a reference when incorporating the capstan motor into a VTR or the like.

As shown in FIG. 9, the large-diameter portion 5g of the bearing holder 5 is formed in a D-shape in cross section, and the small-diameter portion 5h is formed in an oval cross-section. The small diameter portion 5h is basically formed in a cylindrical shape. However, the large-diameter portion 5g and the small-diameter portion 5h serve as a reference when the bearing holder 5 is incorporated into the capstan motor and a reference when the capstan motor is incorporated into the VTR or the like. Need to be provided at a position relatively distant from the center axis of the bearing holder 5. When the large diameter portion 5 g and the small diameter portion 5 h are formed in a cylindrical shape, the thickness of the cylindrical portion 5 c of the bearing holder 5 increases,
The volume of the bearing holder 5 was large. As a result, there is a problem that the material cost of the bearing holder 5 increases and the cost increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and a reference for assembling the bearing holder into the motor without increasing the thickness of the bearing holder, a VTR, etc. It is an object of the present invention to provide a motor that can provide a reference for assembling into a motor, and that can reduce the volume of the entire bearing holder, the cost, and the weight.

[0011]

In order to achieve the above object, the invention according to claim 1 includes a shaft, a rotor case, a driving magnet, a bearing, a bearing holder, a stator core and a stator substrate. a motor comprising a stator, a shaft 受Ho holder is periphery for holding the bearing
The side has an arc-shaped cylindrical portion , and the cylindrical portion has a plurality of protrusions extending radially outward from the outer peripheral side , so that the cylindrical portion has an upper side.
On the outer peripheral side of the cylindrical portion, an arc-shaped portion and a projecting portion intersect in the circumferential direction.
Each other are formed, each protrusion circumscribed circle circumscribing circle with the first positioning portion of the large diameter is formed second positioning portion of the small-diameter peripheral wall of the bore first positioning portion formed in said stator to engage the second positioning unit is characterized that you engage the peripheral wall of the inner hole of the chassis motor is mounted. A first positioning portion and a second positioning portion are formed on a partial protruding portion extending radially outward from the cylindrical portion. The first positioning portion and the second positioning portion are not formed in a cylindrical shape.

According to a second aspect of the present invention, the protrusions of the bearing holder are uniformly arranged around the bearing holder at intervals of 120 °.

According to a third aspect of the present invention, the first positioning portion and the second positioning portion are provided on projecting portions communicating with each other in the axial direction.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a motor according to the present invention will be described below with reference to FIGS. The same components as those in the conventional example are denoted by the same reference numerals, and the features of the present invention will be mainly described.

In FIG. 1, reference symbol S indicates a stator of a capstan motor, and R indicates a rotor of the capstan motor. The rotor R includes a rotor case 6, a shaft 12 press-fitted into a boss formed at the center of the rotor case 6 by burring or the like, and a pulley 28 fixed to the rotor case 6 around the shaft 12. Have. The shaft 12 is a bearing 2 made of a sintered oil-impregnated bearing or the like pressed into the upper and lower ends of the cylindrical portion 5c of the bearing holder 5.
The bearings 24 and 25 are rotatably supported on the shaft 12 through the center holes of the shafts 4 and 25.

The stator S has a bearing holder 5, a stator substrate 4, a core winding set 1, and a core holder 3.
The core holder 3 is placed at the center of the stator core 2 constituting the core winding set 1, and the core holder 3 and the stator substrate 4 are overlapped. Bearing holder from below stator core 2
5 are inserted into the central through holes of the stator core 2 and the core holder 3 and the inner holes 4a of the stator substrate 4. Bearing holder 5
Is a screw 1 on the stator substrate 4 integrally with the stator core 2.
It is fixed at 0. The drive magnet 11 of the rotor case 6 faces the outer periphery of the stator core 2.

As shown in FIGS. 2 to 4, the bearing holder 5 has an inverted T-shape in longitudinal section. In the bearing holder 5, screw through holes 5 b are formed in a flange portion 5 a overlapped with the core winding set 1, and bearings 24 and 25 are formed.
A plurality of projections 5d are formed around the cylindrical portion 5c for holding the screw holes 5a.
e is formed parallel to the axis of the bearing holder 5. However, the cylindrical portion 5c has a small thickness and a small outer diameter, and the cylindrical portion 5c and each protruding portion 5d are formed by ribs 5n.
It is connected by.

The bearing holder 5 also has a plurality of radially outwardly protruding portions 5j on the outer peripheral surface side of the cylindrical portion 5c.
Each projection 5j extends in the axial direction of the bearing holder 5,
A first positioning portion 5k is provided at a base (lower portion in FIGS. 2 and 3) of each protrusion 5j, and the first positioning portion 5k is provided at an upper portion of each protrusion 5j.
A second positioning portion 5m is formed in communication with the positioning portion 5k. The circumcircle 21 of each first positioning portion 5k (see FIG. 4) has a large diameter, and the circumcircle 22 of each second positioning portion 5m has a smaller diameter than the circumcircle 21 of each first positioning portion 5k. The protruding portions 5j forming the first positioning portion 5k and the second positioning portion 5m are arranged evenly at intervals of 120 ° around the bearing holder 5, and thus are arranged at three places. Similarly, the respective protrusions 5d are equally arranged around the bearing holder 5 at intervals of 120 °. Projection portions 5j arranged at three places
One of them is formed with a protrusion 5r for positioning the bearing holder 5 in the circumferential direction with respect to the stator substrate 4 (see FIG. 4). The width of the protrusion 5j is, for example, 0.5
To about 5 mm.

The bearing holder 5 can be mounted on the stator substrate 4 having the same configuration as the stator substrate 4 of the conventional capstan motor described with reference to FIG. The cylindrical portion 5c of the bearing holder 5 is fitted into the inner hole 4a of the stator substrate 4. At this time, the projection 5r of the bearing holder 5 is provided with a notch 4 formed in a part of the inner hole 4a of the stator substrate 4 shown in FIG.
r to position the bearing holder 5 in the circumferential direction. When the cylindrical portion 5c of the bearing holder 5 is fitted into the inner hole 4a of the stator substrate 4, each of the first positioning portions 5 of the bearing holder 5
k is engaged with the peripheral wall of the inner hole 4a formed in the stator substrate 4 constituting a part of the stator S, and the relative positional relationship between the bearing holder 5 and the stator substrate 4 can be accurately set. Screws penetrating the positioned screw holes 5b of the bearing holder 5, the stator core 2 and the core holder 3 are screwed into the screw holes 4e of the stator substrate 4, whereby these stator components are integrally connected.

The capstan motor assembled as described above is mounted on a chassis 20 of a VTR or other various devices. An inner hole 20 similar to the inner hole 4a formed in the stator substrate 4 is also provided in the chassis 20 of various devices.
a is formed (see FIG. 1), and the cylindrical portion 5c of the bearing holder 5 of the capstan motor is fitted into the inner hole 20a. At this time, the second positioning portion 5m of the bearing holder 5 engages with the peripheral wall of the inner hole 20a of the chassis 20, and the relative positional relationship between the bearing holder 5 and the chassis 20, and therefore, the relative position between the capstan motor and the chassis 20. The positional relationship can be set accurately.

According to the embodiment described above, the inner hole 4 formed in the stator substrate 4 forming a part of the stator is formed.
a, and a first positioning portion 5k for setting a relative positional relationship between the stator and the bearing holder 5, and an inner hole 20a of the chassis 20 to which the capstan motor is attached to engage with the capstan motor and the chassis 20. Since the second positioning portion 5m for setting the relative positional relationship is provided on the plurality of protrusions 5j extending radially outward from the cylindrical portion 5c of the bearing holder 5, the cylindrical portion 5c of the bearing holder 5 does not include the protrusion 5j. Thus, the thickness can be reduced, and the volume of the bearing holder 5 can be reduced. As a result, the material cost of the bearing holder 5 is reduced, and the cost can be reduced. By the way, the weight is about 3 times as compared with the conventional bearing holder.
Zero percent weight savings and a volume reduction of about 2/3.

In the embodiment described above, the first
Since the positioning portions 5k and the protruding portions 5j forming the second positioning portions 5m are uniformly arranged around the bearing holder 5 at intervals of 120 °, the relative positional relationship between the stator and the bearing holder 5, the capstan motor, the chassis 20 and The number of the protruding portions 5j can be minimized while accurately setting the relative positional relationship of the bearings, and thus the volume and weight of the bearing holder 5 can be effectively reduced. Further, since the first positioning portion 5k and the second positioning portion 5m are formed at three protruding portions 5j, the accuracy of the diameter and height of the circumcircle of the first positioning portion 5k and the second positioning portion 5m is three. There is also an advantage that the accuracy can be easily obtained by limiting and outputting the data intensively.

In the above embodiment, since the first positioning portion 5k and the second positioning portion 5m are provided intensively on the protruding portions 5j communicating with each other in the axial direction, the volume of the bearing holder can be reduced most efficiently. can do.

As the material of the bearing holder 5, for example, zinc or resin can be used. In the case of zinc, it can be made by die casting, and in the case of resin, it can be made by molding. Further, it can be made by other materials and construction methods, for example, sheet metal processing of a metal plate. Projection 5j forming first positioning portion 5k and second positioning portion 5m
Need not necessarily be provided at three locations, and may be provided at more locations.

The first positioning section 5k and the second positioning section 5m
May be formed on separate projections. For example, a member indicated by a dotted line denoted by reference numeral 5p in FIGS. 2 and 4 is another example of a second positioning portion that is substituted for the second positioning portion 5m, and the second positioning portion 5p
Is integrally formed following the upper end of the rib 5n that connects the cylindrical portion 5c and each protruding portion 5d described above. Rib 5n
Are formed in three places at equal intervals, and therefore, the second positioning portions 5p are also formed in three places at equal intervals. The first positioning portion 5k is formed on the protruding portion 5j as in the above-described example. The above-mentioned rib 5n which is a protruding portion separate from the protruding portion 5j
Since the second positioning portion 5p is formed on the
Although it is not necessary to form the second positioning portion 5m in j, the second positioning portion 5p may be formed after the formation of the second positioning portion 5m. In this case, the second
The positioning portions 5m and 5p are formed on the same circumscribed circle.

The motor according to the present invention is not limited to a capstan motor for a VTR as in the above-described embodiment, but can be applied to a motor for other uses. Further, in the above-described embodiment, the peripheral facing type with the core has been described as an example, but the surface facing type may also be used.
A coreless type may be used, and the type of the motor is not limited.

[0027]

According to the first aspect of the present invention, the motor is attached to the first positioning portion which engages with the peripheral wall of the inner hole formed in the stator to set the relative positional relationship between the stator and the bearing holder. a second positioning portion for setting a relative positional relationship between the inner bore engages motor and chassis in the peripheral wall of the chassis that is, a plurality of protrusions formed outward in the radial direction to the cylindrical portion of the shaft 受Ho holder due to the provision of a cylindrical portion of the shaft 受Ho holder can be made thinner except for the protruding portion, it is possible to reduce the volume of the bearing holder. As a result, the material cost of the bearing holder is reduced, and the cost can be reduced.

According to the second aspect of the present invention, the protrusions forming the first positioning portion and the second positioning portion are evenly arranged around the bearing holder at intervals of 120 °, so that the relative position between the stator and the bearing holder is reduced. The number of protrusions can be suppressed to a minimum while the positional relationship and the relative positional relationship between the motor and the chassis are accurately set, so that the volume and weight of the bearing holder can be effectively reduced. Further, since the first positioning portion and the second positioning portion are formed at three protruding portions, the accuracy of the diameter and height of the circumscribed circle of the first positioning portion and the second positioning portion is limited to three locations and concentrated. In addition, there is an advantage that accuracy can be easily obtained.

According to the third aspect of the present invention, since the first positioning portion and the second positioning portion are provided intensively on the protruding portions communicating with each other in the axial direction, the volume of the bearing holder can be reduced most efficiently. can do.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a half of an embodiment of a motor according to the present invention.

FIG. 2 is a longitudinal sectional view of a bearing holder used in the motor.

FIG. 3 is a front view of the bearing holder.

FIG. 4 is a plan view of the bearing holder.

FIG. 5 is a longitudinal sectional view showing an example of a conventional motor.

FIG. 6 is a plan view of a motor board used in the motor.

FIG. 7 is a longitudinal sectional view of a bearing holder used in the motor.

FIG. 8 is a front view of the bearing holder.

FIG. 9 is a plan view of the bearing holder.

[Explanation of symbols]

 2 Stator core 4 Stator substrate 4a Inner hole 5 Bearing holder 5c Cylindrical part 5j Projecting part 5k First positioning part 5m Second positioning part 6 Rotor case 7 Coil 11 Drive magnet 12 Shaft 20 Chassis 21 Circumscribed circle 22 Circumscribed circle 24 Bearing 25 Bearing S Stator R rotor

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-5-191958 (JP, A) JP-A-6-292339 (JP, A) JP-A 4-101258 (JP, U) JP-A 7-292 23965 (JP, U) Hikaru Hei 2-49373 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 5/16 H02K 5/167

Claims (1)

(57) [Claims] 1. A shaft, a rotor case that rotates integrally with the shaft, a drive magnet mounted on the rotor case, a bearing that rotatably supports the shaft, a bearing holder that holds the bearing, A motor comprising a stator having a stator core having a salient pole wound with a coil, the salient pole facing the drive magnet, and a stator substrate on which a conductive pattern for energizing the coil is formed. , the bearing holder includes an outer peripheral side arcuate circular <br/> tubular portion for holding a bearing, the cylindrical portion, said cylindrical by have a plurality of protrusions extending from the outer peripheral side radially outward Perimeter of part
On the side, arc-shaped portions and protrusions are formed alternately in the circumferential direction ,
Each projection has a first positioning portion having a large circumscribed circle and a second positioning portion having a small diameter circumscribed circle. The first positioning portion is formed on a peripheral wall of an inner hole formed in the stator. The second positioning portion is engaged with a peripheral wall of an inner hole of a chassis to which the motor is attached.